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Although technically classified as a hallucinogen, marijuana has some similarities to depressants.

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For example, marijuana users often report a feeling of relaxation.

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Marijuana also tends to lower blood pressure and depress the functioning of the digestive system.

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Like Alcohol, marijuana reduces people's inhibitions and impairs memory and motor skills.

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Marijuana may also depress male sex hormones and hasten the loss of brain cells.

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Researchers have discovered that the active ingredient in marijuana, a compound called THC

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mimics natural substances in the brain, called cannabinoids that control the release of the neurotransmitter dopamine.

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THC and the natural cannabinoid work through indirect means to increase the amount of dopamine released.

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In particular, regions of the limbic system are involved.

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One area of the limbic system that is most particularly affected is the hippocampus

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which is important in the making our short-term memories permanent.